CN115820094A - Waterborne polyurethane coating and preparation method thereof - Google Patents
Waterborne polyurethane coating and preparation method thereof Download PDFInfo
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- CN115820094A CN115820094A CN202210941455.8A CN202210941455A CN115820094A CN 115820094 A CN115820094 A CN 115820094A CN 202210941455 A CN202210941455 A CN 202210941455A CN 115820094 A CN115820094 A CN 115820094A
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Abstract
The invention relates to a waterborne polyurethane coating and a preparation method thereof, in particular to a waterborne polyurethane coating which is characterized by comprising the following components in parts by weight: 50-70 parts of water-based polyester resin, 1-10 parts of antirust pigment, 1-10 parts of dispersing agent, 1-5 parts of defoaming agent, 1-5 parts of stabilizing agent, 1-5 parts of flatting agent, 1-3 parts of thickening agent, 10-20 parts of isophorone diisocyanate, 1-10 parts of film-forming assistant, 10-20 parts of deionized water and 1-10 parts of compound shown in formula (I). Compared with a comparative example, the waterborne polyurethane coating has high glossiness, excellent corrosion resistance and better mechanical property.
Description
Technical Field
The invention belongs to the technical field of coating materials, and particularly relates to a waterborne polyurethane coating and a preparation method thereof.
Background
The coating is a continuous film which is coated on the surface of a protected or decorated object and can form firm adhesion with the object to be coated, and is a viscous liquid which is prepared by taking resin, oil or emulsion as a main material, adding or not adding pigments and fillers, adding corresponding auxiliary agents and using organic solvent or water. The coating is often made of a chemical mixture and mainly has four functions: protecting, decorating and masking the defects and other special functions of the product so as to improve the value of the product.
The waterborne polyurethane coating takes waterborne polyurethane resin as a base material and water as a solvent, and takes water to replace an organic solvent as a dispersion medium, so that the waterborne polyurethane coating has the advantages of no pollution, safety and reliability, can improve the cold resistance, heat resistance, sunlight aging resistance and chemical corrosion resistance of a coated product, and is widely applied to the field of coatings, but the waterborne polyurethane coating also has the problems of slow drying of a paint film, poor glossiness, low hardness, poor mechanical property or poor salt spray resistance and corrosion resistance. Therefore, it is necessary to develop a new aqueous polyurethane coating material to improve the film forming rate and corrosion resistance and mechanical properties of the coating material.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a waterborne polyurethane coating and a preparation method thereof.
In order to achieve the object of the present invention, in one aspect, the present invention provides an aqueous polyurethane coating, which comprises the following components in parts by weight:
50-70 parts of water-based polyester resin, 1-10 parts of antirust pigment, 1-10 parts of dispersant, 1-5 parts of defoaming agent, 1-5 parts of stabilizer, 1-5 parts of flatting agent, 1-3 parts of thickener, 10-20 parts of isophorone diisocyanate, 1-10 parts of film forming additive, 10-20 parts of deionized water and 1-10 parts of compound shown in formula (I), wherein the compound shown in formula (I) has the following structure:
in some preferred embodiments, the rust inhibitive pigment of the present invention is zinc phosphate.
In some preferred embodiments, the dispersant of the present invention is hydroxypropyl methylcellulose.
In some preferred embodiments, the defoamer described herein is a silicone defoamer SD998.
In some preferred embodiments, the stabilizer of the present invention is the light stabilizer UV-292.
In some preferred embodiments, the leveling agent of the present invention is polyether modified polyorganosiloxane 8030F.
In some preferred embodiments, the thickener of the present invention is selected from the group consisting of TEGOViscoPlus3010 and TEGOViscoPlus3060.
In some preferred embodiments, the coalescents of the present invention include one or more of dipropylene glycol methyl ether, dipropylene glycol butyl ether, and diethylene glycol butyl ether.
In some preferred embodiments, the present invention provides an aqueous polyurethane coating, which is characterized by comprising, in parts by weight: 50-65 parts of water-based polyester resin, 1-5 parts of antirust pigment, 5-10 parts of dispersing agent, 1-3 parts of defoaming agent, 1-3 parts of stabilizing agent, 1-3 parts of flatting agent, 1-3 parts of thickening agent, 10-20 parts of isophorone diisocyanate, 5-10 parts of film-forming assistant, 10-20 parts of deionized water and 5-10 parts of compound shown in formula (I) shown above.
In some preferred embodiments, the present invention provides an aqueous polyurethane coating, which is characterized by comprising, in parts by weight: 50-60 parts of water-based polyester resin, 1-3 parts of antirust pigment, 5-8 parts of dispersing agent, 1-3 parts of defoaming agent, 1-3 parts of stabilizing agent, 1-3 parts of flatting agent, 1-3 parts of thickening agent, 15-20 parts of isophorone diisocyanate, 8-10 parts of film-forming assistant, 15-20 parts of deionized water and 7-10 parts of compound shown in formula (I) shown above.
In some preferred embodiments, the present invention provides an aqueous polyurethane coating, which is characterized by comprising, in parts by weight: 55 parts of water-based polyester resin, 3 parts of anti-rust pigment, 8 parts of dispersant, 2 parts of defoaming agent, 2 parts of stabilizer, 2 parts of flatting agent, 2 parts of thickening agent, 20 parts of isophorone diisocyanate, 10 parts of film-forming assistant, 15 parts of deionized water and 7 parts of compound shown in formula (I) shown above.
The invention also provides a preparation method of the waterborne polyurethane coating, which comprises the following steps:
1) Respectively weighing the water-based polyester resin, the anti-rust pigment, the dispersing agent, the defoaming agent, the stabilizing agent, the flatting agent, the thickening agent, the isophorone diisocyanate, the film-forming assistant, the deionized water and the compound shown in the formula (I) according to the weight percentage;
2) Adding the water-based polyester resin, the anti-rust pigment, the dispersing agent, the defoaming agent, the stabilizing agent, the flatting agent, the thickening agent, the deionized water and the compound shown as the formula (I) into a stirrer for mixing and stirring treatment, wherein the rotating speed is 300-500r/min, and the stirring time is 20-30min;
3) Adding isophorone diisocyanate and a film-forming auxiliary agent, stirring at the speed of 800-1200r/min for 15-30min, and stirring to obtain the waterborne polyurethane coating.
Compared with the prior art, the invention has the beneficial effects that:
the water-based polyurethane coating disclosed by the invention is high in film forming efficiency by adding the compound shown in the formula (I) with a novel structure, and compared with a comparative example, the water-based polyurethane coating has the advantages of high glossiness, excellent corrosion resistance, better mechanical property and wide application prospect.
Detailed Description
The following representative examples are intended to better illustrate the present invention and are not intended to limit the scope of the present invention. The materials used in the following examples are all commercially available unless otherwise specified.
Part of raw material sources are as follows:
waterborne polyester resin, model WB-900, was purchased from Kazakh (Shanghai) trade company, inc.
Preparation of the Compounds of formula (I)
1-pyrenebutanoic acid (CAS: 3443-45-6,57.67g, 0.20mol) was dissolved in N, N-dimethylformamide (500 mL), and potassium carbonate (83.0 g, 0.60mol), 3-diphenylpropylbromide (CAS: 20017-68-9,66.04g, 0.24mol) were added. The reaction was carried out at 25 ℃ overnight. The reaction solution was added with 400mL of water, extracted with ethyl acetate, washed with saturated brine 2 times, dried over anhydrous sodium sulfate, and spin-dried to obtain the compound represented by formula (I). MS m/z (ESI): 483.1[ M ] +H] + 。
Example 1
The waterborne polyurethane coating comprises the following raw materials in parts by weight: 55 parts of water-based polyester resin, 3 parts of zinc phosphate, 8 parts of hydroxypropyl methyl cellulose, 998 parts of an organic silicon defoamer SD, 2 parts of a light stabilizer UV-292, 2 parts of polyether modified polyorganosiloxane 8030F, 2 parts of TEGOViscoPlus3010 parts, 20 parts of isophorone diisocyanate, 10 parts of dipropylene glycol methyl ether, 15 parts of deionized water and 7 parts of the compound shown in the formula (I) prepared in the preparation example.
1) Respectively weighing the water-based polyester resin, zinc phosphate, hydroxypropyl methyl cellulose, an organic silicon defoamer SD998, a light stabilizer UV-292, polyether modified polyorganosiloxane 8030F, TEGOVisco plus3010, isophorone diisocyanate, dipropylene glycol methyl ether, deionized water and the compound shown in the formula (I) prepared by the preparation example according to the weight percentage;
2) Adding water-based polyester resin, zinc phosphate, hydroxypropyl methyl cellulose, an organic silicon defoamer SD998, a light stabilizer UV-292, polyether modified polyorganosiloxane 8030F, TEGOVisco plus3010, deionized water and the compound shown in the formula (I) prepared by the preparation example into a stirrer for mixing and stirring treatment, wherein the rotating speed is 300r/min, and the stirring time is 30min;
3) Adding isophorone diisocyanate and dipropylene glycol methyl ether, stirring at the speed of 1200r/min for 15min, and finishing stirring to obtain the waterborne polyurethane coating.
Example 2
The waterborne polyurethane coating comprises the following raw materials in parts by weight: 65 parts of water-based polyester resin, 5 parts of zinc phosphate, 10 parts of hydroxypropyl methyl cellulose, 998 parts of an organic silicon defoamer SD, 3 parts of a light stabilizer UV-292, 3 parts of polyether modified polyorganosiloxane 8030F, 30103 parts of TEGOViscoPlus, 20 parts of isophorone diisocyanate, 5 parts of diethylene glycol monobutyl ether, 10 parts of deionized water and 10 parts of a compound shown in a formula (I) prepared by a preparation example.
1) Respectively weighing the water-based polyester resin, zinc phosphate, hydroxypropyl methyl cellulose, an organic silicon defoamer SD998, a light stabilizer UV-292, polyether modified polyorganosiloxane 8030F, TEGOVisco plus3010, isophorone diisocyanate, diethylene glycol butyl ether, deionized water and the compound shown in the formula (I) prepared by the preparation example according to the weight percentage;
2) Adding water-based polyester resin, zinc phosphate, hydroxypropyl methyl cellulose, an organic silicon defoamer SD998, a light stabilizer UV-292, polyether modified polyorganosiloxane 8030F, TEGOVisco plus3010, deionized water and the compound shown in the formula (I) prepared by the preparation example into a stirrer for mixing and stirring treatment, wherein the rotating speed is 300r/min, and the stirring time is 30min;
3) Adding isophorone diisocyanate and diethylene glycol butyl ether, stirring at the speed of 1200r/min for 15min, and finishing stirring to obtain the waterborne polyurethane coating.
Example 3
The waterborne polyurethane coating comprises the following raw materials in parts by weight: 50 parts of water-based polyester resin, 2 parts of zinc phosphate, 5 parts of hydroxypropyl methyl cellulose, 5 parts of silicone defoamer SD998 parts, 1 part of light stabilizer UV-292, 1 part of polyether modified polyorganosiloxane 8030F, 3060 part of TEGOViscoPlus, 10 parts of isophorone diisocyanate, 8 parts of dipropylene glycol butyl ether, 20 parts of deionized water and 5 parts of the compound shown in the formula (I) prepared by the preparation example.
1) Respectively weighing the water-based polyester resin, zinc phosphate, hydroxypropyl methyl cellulose, an organic silicon defoamer SD998, a light stabilizer UV-292, polyether modified polyorganosiloxane 8030F, TEGOViscoPlus3060, isophorone diisocyanate, dipropylene glycol butyl ether, deionized water and the compound shown in the formula (I) prepared by the preparation example according to the weight percentage;
2) Adding water-based polyester resin, zinc phosphate, hydroxypropyl methyl cellulose, an organic silicon defoamer SD998, a light stabilizer UV-292, polyether modified polyorganosiloxane 8030F, TEGOVisco plus3060, deionized water and the compound shown in the formula (I) prepared by the preparation example into a stirrer for mixing and stirring treatment, wherein the rotating speed is 500r/min, and the stirring time is 20min;
3) Adding isophorone diisocyanate and dipropylene glycol butyl ether, stirring at the speed of 800r/min for 30min, and finishing stirring to obtain the waterborne polyurethane coating.
Example 4
The waterborne polyurethane coating comprises the following raw materials in parts by weight: 55 parts of water-based polyester resin, 3 parts of zinc phosphate, 8 parts of hydroxypropyl methyl cellulose, 998 parts of an organic silicon defoamer SD998 parts, 1 part of a light stabilizer UV-292 part, 1 part of polyether modified polyorganosiloxane 8030F, 1 part of TEGOViscoplus3060 part, 20 parts of isophorone diisocyanate, 8 parts of dipropylene glycol butyl ether, 20 parts of deionized water and 10 parts of the compound shown in the formula (I) prepared by the preparation example.
1) Respectively weighing the water-based polyester resin, zinc phosphate, hydroxypropyl methyl cellulose, an organic silicon defoamer SD998, a light stabilizer UV-292, polyether modified polyorganosiloxane 8030F, TEGOViscoPlus3060, isophorone diisocyanate, dipropylene glycol butyl ether, deionized water and the compound shown in the formula (I) prepared by the preparation example according to the weight percentage;
2) Adding water-based polyester resin, zinc phosphate, hydroxypropyl methyl cellulose, an organic silicon defoamer SD998, a light stabilizer UV-292, polyether modified polyorganosiloxane 8030F, TEGOVisco plus3060, deionized water and the compound shown in the formula (I) prepared by the preparation example into a stirrer for mixing and stirring treatment, wherein the rotating speed is 400r/min, and the stirring time is 20min;
3) Adding isophorone diisocyanate and dipropylene glycol butyl ether, stirring at the speed of 1000r/min for 20min, and finishing stirring to obtain the waterborne polyurethane coating.
Comparative example 1
The waterborne polyurethane coating comprises the following raw materials in parts by weight: 55 parts of water-based polyester resin, 3 parts of zinc phosphate, 8 parts of hydroxypropyl methyl cellulose, 998 parts of an organic silicon defoamer SD, 2 parts of a light stabilizer UV-292, 2 parts of polyether modified polyorganosiloxane 8030F, 30102 parts of TEGOVisco plus, 20 parts of isophorone diisocyanate, 10 parts of dipropylene glycol methyl ether and 15 parts of deionized water.
1) Respectively weighing the water-based polyester resin, zinc phosphate, hydroxypropyl methyl cellulose, an organic silicon defoamer SD998, a light stabilizer UV-292, polyether modified polyorganosiloxane 8030F, TEGOViscoPlus3010, isophorone diisocyanate, dipropylene glycol methyl ether and deionized water according to the weight percentage;
2) Adding water-based polyester resin, zinc phosphate, hydroxypropyl methyl cellulose, an organic silicon defoamer SD998, a light stabilizer UV-292, polyether modified polyorganosiloxane 8030F, TEGOVisco plus3010 and deionized water into a stirrer to be mixed and stirred at the rotating speed of 300r/min for 30min;
3) Adding isophorone diisocyanate and dipropylene glycol methyl ether, stirring at the speed of 1200r/min for 15min, and finishing stirring to obtain the waterborne polyurethane coating.
Experimental examples Performance test
The aqueous polyurethane coatings prepared in examples 1 to 4 and comparative example 1 were applied to the surface of a coil steel having a length, width and height of 200 x 10, and subjected to a related performance test, wherein the test items include: performing appearance and reverse impact tests of the coating according to the test standard of HGT 3830-2006; testing the gloss (60 ℃) according to the test standard GB/T1743-79; the salt spray resistance test (5% salt water soaking) is carried out according to the test standard GB/T1771, and the test results are shown in Table 1
Table 1 results of performance testing
Therefore, the aqueous polyurethane coating has high film forming efficiency, and has high glossiness, excellent corrosion resistance and better mechanical property compared with a comparative example.
Although the present invention has been described in detail hereinabove, those skilled in the art will appreciate that various modifications and changes can be made thereto without departing from the spirit and scope of the present invention. The invention is not to be restricted by the above embodiments but is intended to cover all modifications, alterations, substitutions, combinations, and simplifications which may be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
1. The waterborne polyurethane coating is characterized by comprising the following components in parts by weight:
50-70 parts of water-based polyester resin, 1-10 parts of antirust pigment, 1-10 parts of dispersant, 1-5 parts of defoaming agent, 1-5 parts of stabilizer, 1-5 parts of flatting agent, 1-3 parts of thickener, 10-20 parts of isophorone diisocyanate, 1-10 parts of film forming additive, 10-20 parts of deionized water and 1-10 parts of compound shown in formula (I), wherein the compound shown in formula (I) has the following structure:
2. the aqueous polyurethane coating according to claim 1, wherein the rust preventive pigment is zinc phosphate.
3. The waterborne polyurethane coating of claim 1, wherein the dispersant is hydroxypropyl methylcellulose.
4. The waterborne polyurethane coating as claimed in claim 1, wherein the defoamer is an organosilicon defoamer SD998.
5. The waterborne polyurethane coating of claim 1, wherein said light stabilizer is UV-292.
6. The aqueous polyurethane coating according to claim 1, wherein the leveling agent is polyether modified polyorganosiloxane 8030F;
and/or said thickener is selected from the group consisting of TEGOVisco plus3010 and TEGOVisco plus3060;
and/or the film forming aid comprises one or more of dipropylene glycol methyl ether, dipropylene glycol butyl ether and diethylene glycol butyl ether.
7. The waterborne polyurethane coating of claim 1, wherein the coating comprises, in parts by weight: 50-65 parts of water-based polyester resin, 1-5 parts of antirust pigment, 5-10 parts of dispersing agent, 1-3 parts of defoaming agent, 1-3 parts of stabilizing agent, 1-3 parts of flatting agent, 1-3 parts of thickening agent, 10-20 parts of isophorone diisocyanate, 5-10 parts of film-forming assistant, 10-20 parts of deionized water and 5-10 parts of compound shown in formula (I) in claim 1.
8. The waterborne polyurethane coating of claim 1, wherein the coating comprises, in parts by weight: 50-60 parts of water-based polyester resin, 1-3 parts of antirust pigment, 5-8 parts of dispersing agent, 1-3 parts of defoaming agent, 1-3 parts of stabilizing agent, 1-3 parts of flatting agent, 1-3 parts of thickening agent, 15-20 parts of isophorone diisocyanate, 8-10 parts of film-forming assistant, 15-20 parts of deionized water and 7-10 parts of compound shown in formula (I) in claim 1.
9. The waterborne polyurethane coating of claim 1, wherein the coating comprises, in parts by weight: 55 parts of water-based polyester resin, 3 parts of antirust pigment, 8 parts of dispersant, 2 parts of defoaming agent, 2 parts of stabilizer, 2 parts of flatting agent, 2 parts of thickening agent, 20 parts of isophorone diisocyanate, 10 parts of film-forming assistant, 15 parts of deionized water and 7 parts of compound shown in formula (I) in claim 1.
10. A method of preparing an aqueous polyurethane coating of claims 1-9, comprising:
1) Respectively weighing the water-based polyester resin, the anti-rust pigment, the dispersing agent, the defoaming agent, the stabilizing agent, the flatting agent, the thickening agent, the isophorone diisocyanate, the film-forming assistant, the deionized water and the compound shown in the formula (I) in the claim 1 according to the weight percentage of the water-based polyester resin, the anti-rust pigment, the dispersing agent, the defoaming agent, the stabilizing agent, the flatting agent, the thickening agent, the isophorone diisocyanate, the film-forming assistant, the deionized water and the compound shown in the claim 1;
2) Adding water-based polyester resin, an anti-rust pigment, a dispersing agent, a defoaming agent, a stabilizing agent, a flatting agent, a thickening agent, deionized water and the compound shown in the formula (I) in claim 1 into a stirrer for mixing and stirring treatment, wherein the rotating speed is 300-500r/min, and the stirring time is 20-30min;
3) Adding isophorone diisocyanate and a film-forming auxiliary agent, stirring at the speed of 800-1200r/min for 15-30min, and stirring to obtain the waterborne polyurethane coating.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1180664A (en) * | 1997-09-16 | 1999-03-26 | Toyo Ink Mfg Co Ltd | Aqueous coating composition for can |
| WO2010018763A1 (en) * | 2008-08-11 | 2010-02-18 | 関西ペイント株式会社 | Water-base coating composition |
| CN110054979A (en) * | 2018-01-19 | 2019-07-26 | 中国科学院福建物质结构研究所 | A kind of aqueous coating for plastic and its preparation method and application |
| US20210371697A1 (en) * | 2017-12-07 | 2021-12-02 | Basf Coatings Gmbh | Scratch and Mar Resistant Automotive Coatings |
-
2022
- 2022-08-08 CN CN202210941455.8A patent/CN115820094B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1180664A (en) * | 1997-09-16 | 1999-03-26 | Toyo Ink Mfg Co Ltd | Aqueous coating composition for can |
| WO2010018763A1 (en) * | 2008-08-11 | 2010-02-18 | 関西ペイント株式会社 | Water-base coating composition |
| US20210371697A1 (en) * | 2017-12-07 | 2021-12-02 | Basf Coatings Gmbh | Scratch and Mar Resistant Automotive Coatings |
| CN110054979A (en) * | 2018-01-19 | 2019-07-26 | 中国科学院福建物质结构研究所 | A kind of aqueous coating for plastic and its preparation method and application |
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